13890478991 has 2 divisors, whose sum is σ = 13890478992. Its totient is φ = 13890478990.

The previous prime is 13890478891. The next prime is 13890478993. The reversal of 13890478991 is 19987409831.

It is a strong prime.

It is an emirp because it is prime and its reverse (19987409831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13890478991 - 2¹⁰ = 13890477967 is a prime.

Together with 13890478993, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13890478991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13890478993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6945239495 + 6945239496.

It is an arithmetic number, because the mean of its divisors is an integer number (6945239496).

Almost surely, 2^13890478991 is an apocalyptic number.

13890478991 is a deficient number, since it is larger than the sum of its proper divisors (1).

13890478991 is an equidigital number, since it uses as much as digits as its factorization.

13890478991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3919104, while the sum is 59.

The spelling of 13890478991 in words is "thirteen billion, eight hundred ninety million, four hundred seventy-eight thousand, nine hundred ninety-one".